Mold vibrator



Dec. 18,1934. c. Du-:TRlcl-ls 1,934,363

MOLD VIBRA'I'OR` l Filed Feb. 24, 1930 s 'sheets-smet 1 d 2 .xNyENToR BY Dec. 18, 19,34. c. mETRlcl-ls MOLD VIBRATOR Filed Feb. 24, 195o 3 Sheets-Sheet 2 INVENTOR Dec. 1s, 1934.

C. D IETRICHS 'MOLD VIBRATOR Filed Feb. 24, 1930 5 Sheets-Sheet 3 o y R. 6., 0 Q m.. O O E, .0. a 2M w v\ M. .W4 QN a y. M mi R v... m .04 1 Fn.. N L. H. H|. |I I. M -.I f.- .Q www.. hi 4. mw mi @a Patented Dec. 1a, 1934 1,984,353

UNITED STATES I PATENT OFFICE MOLD VIBRATOR .l Charles Dietriclis, Little Ferry, N. J.. assigner to Walker Cement Products, Inc., Little Ferry, N. J., a corporation of New Jersey pacman rem-um u, im, sean N0. 430.164

c clam (c1. zs-m 'I'his invention relates to mechanical vibrators frame members. 'Ihe holes through which the for molds, particularly molds vfor articles made pins pass are larger than the pins so as to permit oi' cement, such as building blocks, drain tiles, and a slight lateral play of the table. the like. Fastened to the under side of the table 4 are a 'I'he object of the invention is to provide a pair of ilat steel springs 9 whose free ends rest on 5 mechanical vibrator for vibrating the mold and ratchets carried by a shaft l1 which is mounted causing a proper settling oi the'cement mixture in journals 12 at the opposite ends of the side While the mold is being illled, thereby -obviating members. 'I'he shaft 11 may be driven from any the necessity of tamping, and securing a more unisuitable source of power, for example the belt 10. form product than can be otherwise obtained. pulley 13 shown in the drawings. Also, of course, 10

A further object of the invention is to provide a an electric motor may be employed and for some molding apparatus for molding drain tile embodypurposes I prefer an electric motor for the reason ing means for iinishing oi!- the upper edge of the that it may be readily supplied with a time switch drain tile after the mold is lled and the cement to insure that each mold is given the same period l5 has been caused to settle by the action of the viof vibration, thereby insuring uniformity in the l5 brator, whereby no further operation is required product. 'I'he springs 9 do not rest on top of the on the drain tile after it is removed from the ratchet, but are positioned to be engaged by the vibrator. face of the tooth on the side of the ratchet to- In the accompanying draw' s I have iliusward the table. Otherwise stated, the springs are l trated several practical embodiments of my inlong enough for their ends to project just within 20 vention. the circumference of the circle defined by the In Said drawings. outermost e'dge ot theratchet teeth. Hence, as Fig. 1 illustrates in perspective a vibrator each tooth passes the end of the springs the free wherein the vibrating element is a plain table ends of the springs will be lifted, and then pass adapted to receive molds of any description. oi! th tooth into space where it can freely vibrate 25 Figs. 2, 3 and 4 are detail sectional views on foramoment. the correspondingly numberedlines of Fig. l; The--ends of the springs are attached to the Fig. 5 shows in vertical section a modled form under side of the table by any suitable means. of vibrator adapted primarily for pipe molds but For'example, they may be riveted at their far otherwise substantially oi the same construction ends and heid against the adjacent; edge of the 30 as the Vbrtr ShOWn in F18. 1: table by yokes 14, to thereby avoid the necessity Fig. 6 shows in vertical section a modified form oi putting a hole through the springs at a point of pipe mold vibrator wherein the core as well as where the greatest strain comes.

the outside shell is vibrated; l By having the springs but slightly overlapping f Fig. 7 is a detail sectional v ew on the correthe teeth of the ratchet as described, the ratchet 35 SDOndingly numbered line 0f s.' 6: and may be rapidly rotated without the expenditure Fig. 8 is a sectional view oi' my improved pipe of much power. Also, the amplitude of direct mold VibratOr equipped with an end finishing movement is relatively small. 'I'he rotation of mechanism to thereby produce a complete pipe the ratchet thus eil'ects a series of rapid knocks 40 molding machine. against the end of the springs. which serve t0 40 Referring to the drawings, particularly to Fig. set up in the springs a vibration very much like 1. 1 indicates the supporting members for the that set up in a tuning fork, which vibration is vibrator here shown as angle irons rigidly bolted imparted to the table and consequently to the to a cement or other suitable base. Attached mold or other article resting on the table.

to each corner of the two angle irons 1 are vertical I have found that the use of the vibrating table 45 angles 2 forming the legs o! the trame and supin the molding of concrete blooks entirely 0bported at the upper ends o! the vertical angles are viste; the necessity of tamping the material in side frame members 3 on which the vibrating table the molds and that a much denser and more uni- 4 is directly supported. The vibrating table conform product can be obtained. f

ssts of a steel plate extending from one side In Fig. 5 I have shown a modiilcation of the 50 member 3 to the other and held looselyin position vibrating table of Fig. 1 to adapt it for use in thereon by tapered pins 5 at the corner of the connection with the molding of drain tile. As plate. The pins 5 are set in the flanges of the here shown the table 4a is provided with a series side members and project through rubber plugs 6 of transversely extending cores 16v for the pipe cemented or otherwise secured to the top oi' the molds. As shown. the cores are made ot hollow 55 steel tubes somewhat tapered. The' cores are fastened at their larger ends to the table by means of rings 1'1 beneath the table. Resting on the table and surrounding the core is a base member 18 for shaping the end of the tile; 'Ihis base member consists of a cast iron ring restingI at its inner edge on the table and extending thence upwardly and outwardly to give a tapered neck to the drain tile.

The upper face of the ring is formed with a shoulder 19 and an outwardly extending horizontal ange 20 on which the outer member 21 of the pipe mold is supported. 'Ihis outer member may consist of a length of cylindrical pipe of the proper diameter or if desired the mold may be split on one side to permit its ready removal from the pipe after it is set sumciently.

The table mounting and its vibrating mechanism is the same as employed for the plain table. In using this form of the device the rings 18 and the outer mold sections 21 are assembled on the cores and the intervening space lled with cement mixture. The vibrating mechanism is set in operation, causing the cement to settle, the duration of the vibration determining the density of the resulting pipe. As soon as the vibration of the table, is stopped the base rings and outer mold members with the contained drain pipe are stripped oi the cores and set aside for the tile to set. While the vibration of the table causes the cement to settle into a compact mass between the core and the outer section of the mold, I find that the molds are not so diflicult to remove from the cores as when the mixture is tamped to the' same density. This is doubtless due to the relative vibration between thekouter mold member and the cores which are xedly supported on the cross channel. The relative movement is very slight, but it is sulcient to prevent a strong adhesion between the cement and the core, particularly as the molded tile are removed from the machine immediately upon stopping the vibrator.

In Figs. 6 and '7 I have shown a modied form of mechanism wherein the core and thetable are subjected to vibration. In this construction the vibrating table is substantially the same as in the mechanism illustrated in Figs. 5 and 6. The core 22 is detachably supported on the table by means of lugs 23 and adapted to be connected to the table by means of bolts inserted in holes in the table. The core itself is preferabLy expansible and consists of a piece of sheet steel rolled to form a cylinder with the edges of the sheet slightly overlapping. Attached to one of the overlapping edges is a vertical angle member 25 with its radial face substantially flush with the edge of the steel cylinder. Attached to the other of the overlapping edges, but spaced back from the edge a slight distance is another vertical angle member 26.. Extending between the two angle members is a plate or bar 27 whose upper end projects beyond the top of the core and is provided with a handle 28 whereby the bar may be turned. The two angle members 25 and 28 are held against the sides of the bar by means of a spring 29 supported on a bolt 30 in the inner edges of the two angle members in the manner shown in Fig. 6. A similar construction is provided near the bottom of the core so that Yon rotation of the bar the core will be expanded and contracted uniformly throughout its length.

The mechanism so far ldescribed may be employed in molding pipe in the same manner as the arrangement illustrated inV Fig. 5. l prefer,

however, to independently vibrate the core. This is accomplished by means of a second ratchet shaft 31v mounted for rotation on the cross mem.- ber 24 and preferably driven from the shaft 11 by means of a belt or sprocket chain. 'Ihe shaft 31 is provided with apair of ratchets 32 and engaging the teeth of the ratchets are a pair of metal bars of spring steel 33 which extend downwardly from the top of the core. The bars are not attached directly to the core, but are preferably suspendedfrom the upper ends of a second pair of spring bars 34 which are in turn supported at their lower ends on brackets 35 attached to the inner face of the core. 'I'he ends of the bars 33 overlap the ratchet wheels just sufficient for the uppermost teeth on the 'ratchets to engage the ends ofthe bars and impart to them a slight lateral movement as the ratchet wheels are turned. The vibration produced by the eiect of the ratchet sets up in the springs an oscillation which imparts to the core a rapid vibration of slight amplitude.

By vibrating both the core and the mold the desired density of the drain tile may be secured more rapidly than when only the table is vibrated and also a greater uniformity throughout the height and thickness of the drain tile is obtained. The arrangement of Fig. 7 is particularly applicable to large tiles, but may of course be used with smaller tiles if desired: The contractible core permits the ready removal of the tiling. This construction is also particularly useful with the larger sizes of tile.

In Fig. 8 I have illustrated a complete molding apparatus for molding drain tile. This apparatus includes a vibrating table of the kind shown in Figs. 6 and 7, with which there is combined an end-shaping attachment whereby after 4the charge of cement has been caused to settle in the mold by the action of the table, the upper end of the pipe may be shaped to give the proper contour to the end face of the pipe so that the several pipe sections will project one into the other when laid.

As shown, this apparatus comprises an elevated framework 50 supported on standards 51 rising from the side channels 2 of the main table. The frame comprises a pair of channels 52, 53, respectively, at each side of the table and xedly attached to the inner upper ends of the uprights 51. The channels are spaced apart so that the upper ange of the channel 52 'and the lower ange ofthe channel 53 form guides at each side of the frame, in which guides there is mounted for sliding movement in a plane parallel with" the face of the table a carriage consisting of a plate 54 whose side edges rest on the upper anges of the frame members 52 and a plurality of transverse channels 55 extending acrss the plate at each edge and at spaced intervals between, the

flanges of the channels being of a depth for their ends to move freely below the lower flange of the upper members 53.- Attached to the under side of the plate 54 is a rack 56 which meshes with a pinion 57 carried by the axle of a hand wheel 58 suitably supported in brackets on the rear uprights 51,

The upper frame members 53 project forwardly beyond the forward frame members 51 a suiilcient distance for their ends to overlie the centers of the cores 22 when supported in position on the vibrating tab e.

At the forward end of the plate 54 a series of nuts 59 are welded or otherwise secured to the under side oi the plate in positions corresponding.

'combination of a table, resilient supporting with the centers of the molds when the carriage is 'shifted to its forward position, as illustrated A in Pig. 8. Supported in each of the nuts 59 is a threaded shaft carrying a hand wheel 61 by means of which it may be rotated. Attached to the end of the shaft 59 is a plate 62 of a diameter slightly greater than the diameter of the pipe to be shaped and attached to the outer face of the plate near its periphery vis a shaping ring 63 formed of sheet metal and bent to a shape corresponding with the footpiece 20 attached to the table whereby the upper ends of the pipes willl be of a shape complementary to that of the lower ends of the pipes, as will be obvious.

'I'he plate 62 is preferably detachably connected to the end of the shaft so that plates of different sizes and with differently shaped rings may be employed. I

In operating the apparatus the molds are lied hush with the top as previously described, and cover 39 is put in place as shown in Fig. 6. The table and core are then vibrated, as described, for the proper length of time, thereby causing the settling of the material in the mold. The cover 39 is then removed and hand wheel 58 is operated to move the carriage from the dotted line position shown inFig. 8 to the full line position, thereby bringing the end-shaping rings over the respective molds. The handwheel 81 is then operated to press the shaping rings down against the material in the mold, thereby shaping the end of the pipe to conform with the shapeof the ring.

...After the end of the pipe is shaped the parts are returned to the dotted line position, the core of the mold is contracted and the outer section of the mold strippedo the core with the pipe in the mold, in which it is allowed to remain until sumciently set to be removed without damage.

I claim:

1. In a machinefor molding cement pipe, the combination of a table, resilient supporting means therefor, a core mounted on the table, an outer mold section surrounding said core thereby forming an annular mold for the pipe, means fork vibrating the table in one direction, and independent means for vibrating the core in a direction at right angles thereto.

2. In a machine for molding cement pipe, the

means for said table, a core -mounted on the table, an outer mold section surrounding said core thereby forming an annular mold for the pipe, means for imparting to the table a desired frequency of vibration, and independent means for imparting to the core a different frequency of vibration.

3. In a machine for molding cement pipe, the combination of a table, resilient supporting means for said table, a core mounted on the table. an outer mold section surrounding said core thereby forming an annular mold for the pipe, means for imparting to the table a desiredy frequency of vibration, and independent means for imparting to the core a higher frequency of vibration.

4.' In a machine for molding concrete articles, a mold support, means for resiliently supporting the same, an elongated plate spring rigidly secured at one end to said support and projecting freely therefrom, and a toothed wheel mounted for rotation adjacent the free end of said spring, the end of said spring coacting with the tips only of the teeth of said wheel whereby the spring is allowed to vibrate freely` after each release thereof by said teeth.

5. In a machine for molding cement pipe, the combination of a table, means for resiliently supporting said table, an annular pipe mold mounted on saidtable comprising a core and an outer mold section surrounding said core, a flexible resilient member fixed at one end to said table and projecting freely therefrom,'a second flexible resilient member fixed at one end to said core and projecting freely therefrom, and means for setting up vibrations in each of said flexible resilient` members to thereby effect vibratory movements of said table and said core.

6. In a machine for molding cement pipe, the combination of a table, resilient supporting means therefor, a core mounted on the table, an outer mold section surrounding said core thereby forming an annular mold for the pipe, means for vibrating the table in the vertical direction and independent means for vibrating the core in the horizontal direction.

CHARLES DIETRICHS. 

